diff --git a/docs/ckb-anyone-can-pay.md b/docs/ckb-anyone-can-pay.md
deleted file mode 100644
index aa8d113..0000000
--- a/docs/ckb-anyone-can-pay.md
+++ /dev/null
@@ -1,94 +0,0 @@
-# ckb-anyone-can-pay
-
-CKB anyone-can-pay lock.
-
-[RFC Draft](https://talk.nervos.org/t/rfc-anyone-can-pay-lock/4438)
-
-## Build
-
-``` sh
-make all-via-docker && cargo test
-```
-
-## Quick start
-
-### Create
-
-1, create a cell to receive UDT and CKB:
-
-```
-Cell {
-    lock: {
-        code_hash: <any-one-can-pay>
-        args: <pubkey hash>
-    }
-    data: <UDT amount>
-    type: <UDT>
-}
-```
-
-2, create a cell to receive only CKB:
-
-```
-Cell {
-    lock: {
-        code_hash: <any-one-can-pay>
-        args: <pubkey hash>
-    }
-    data: <empty>
-    type: <none>
-}
-```
-
-3, we can add minimum amount transfer condition:
-
-```
-Cell {
-    lock: {
-        code_hash: <any-one-can-pay>
-        args: <pubkey hash> | <minimum CKB> | <minimum UDT>
-    }
-    data: <UDT amount>
-    type: <UDT>
-}
-```
-
-`minimum CKB` and `minimum UDT` are two optional args, each occupied a byte, and represent `10 ^ x` minimal amount. The default value is `0` which means anyone can transfer any amount to the cell. A transfer must satisfy the `minimum CKB` **or** `minimum UDT`.
-
-If the owner only wants to receive `UDT`, the owner can set `minimum CKB` to `255`.
-
-### Send UDT and CKB
-
-To transfer coins to an anyone-can-pay lock cell, the sender must build an output cell that has the same `lock_hash` and `type_hash` to the input anyone-can-pay lock cell; if the input anyone-can-pay cell has no `data`, the output cell must also be empty.
-
-```
-# inputs
-Cell {
-    lock: {
-        code_hash: <any-one-can-pay>
-        args: <pubkey hash> | <minimum CKB: 2>
-    }
-    data: <empty>
-    type: <none>
-    capacity: 100
-}
-...
-
-# outputs
-Cell {
-    lock: {
-        code_hash: <any-one-can-pay>
-        args: <pubkey hash> | <minimum CKB: 2>
-    }
-    data: <empty>
-    type: <none>
-    capacity: 200
-}
-...
-```
-
-### Signature
-
-The owner can provide a secp256k1 signature to unlock the cell, the signature method is the same as the [P2PH](https://github.com/nervosnetwork/ckb-system-scripts/wiki/How-to-sign-transaction#p2ph).
-
-Unlock a cell with a signature has no restrictions, which helps owner to manage the cell as he wants.